FR446872A - Telephone transmitter - Google Patents

Telephone transmitter

Info

Publication number
FR446872A
FR446872A FR446872A FR446872DA FR446872A FR 446872 A FR446872 A FR 446872A FR 446872 A FR446872 A FR 446872A FR 446872D A FR446872D A FR 446872DA FR 446872 A FR446872 A FR 446872A
Authority
FR
France
Prior art keywords
telephone transmitter
telephone
transmitter
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
FR446872A
Other languages
French (fr)
Inventor
Charles Bouvet
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
CHARLES BOUVET
Original Assignee
CHARLES BOUVET
Filing date
Publication date
Application filed by CHARLES BOUVET filed Critical CHARLES BOUVET
Application granted granted Critical
Publication of FR446872A publication Critical patent/FR446872A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R21/00—Variable-resistance transducers
    • H04R21/02—Microphones
    • H04R21/021—Microphones with granular resistance material

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
FR446872A 1911-10-12 Telephone transmitter Expired FR446872A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR446872T

Publications (1)

Publication Number Publication Date
FR446872A true FR446872A (en) 1912-12-17

Family

ID=8900557

Family Applications (4)

Application Number Title Priority Date Filing Date
FR16299A Expired FR16299E (en) Telephone transmitter
FR17066A Expired FR17066E (en) Telephone transmitter
FR16502A Expired FR16502E (en) Telephone transmitter
FR446872A Expired FR446872A (en) 1911-10-12 Telephone transmitter

Family Applications Before (3)

Application Number Title Priority Date Filing Date
FR16299A Expired FR16299E (en) Telephone transmitter
FR17066A Expired FR17066E (en) Telephone transmitter
FR16502A Expired FR16502E (en) Telephone transmitter

Country Status (1)

Country Link
FR (4) FR446872A (en)

Also Published As

Publication number Publication date
FR16299E (en) 1912-12-24
FR17066E (en) 1913-06-19
FR16502E (en) 1913-02-21

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